It is possible to bend through bolt stocks. Just completed three in the last two weeks. Been doing through bolt gun bending for over 25 years. Yes, you have to take care as KY Jon says and yes it is hard to bend a stock when the stock bolt acts as a spring inside the wood. Usually boring the hole one drill size over the current size is enough to make a bend of 3/8" without too many problems. I use heat and oil to bend stocks.

Dennis Earl Smith/Benefactor Life NRA, ACGG Professional member